Air compressor or pump



J. SZCZEPANEK AIR COMPRESSOR OR PUMP April 16, 1957 2 Sheets-Sheet 2 Filed April 21, 1955 HTTOE/YEY United States Patent AlR COMPRES OR OR-FUMP lohnszczepaneli, Ghitiagh; Ill. Application April-.21; 1955, Serial- No. 502,9s1 4 claims. or. 103-123.

,My invention relates to improvements in air compresmrspurrips or similar devices.

This application is a continuation iupart of a previous application which resultedin the issuance to YIBB of United StatesLetter-s Patent .No. 2,699,288 on lanuary 1-1, 1955.

My invention relates more particularly to improvementsin the construction ofdevicesof this type wherein theparts are generally {greatly simplified and the chieiency of the simplified construction is very high;

While the construction which will be explained and described is directed particularly to smallr or portable typesofcompressors'or pumpss'uch .asareused for paint spray guns, etc, it will be understood 'that'the invention is not so-litnited, and the size or capacity of the-constructionis-not restricted-to the details of construction which will be shown.

The principal object'of the present inventionis to provide an improved air. compressor or pump construction.

A further object isto provide such construction with a minimum of: movingv parts, yet which function in a highly eiiicient manner for? thepurp'osedesired.

A" further object ofthe invention-is to provide-a compressor or pump of the typedescribed that'has an improved valve construction;

A further object of the invention-is to provide a compressor or pump -of the type describedwith a novel cooperationof the rotor-'andthevalve mechanism so that no springs need be erriployed therewith;-

A: further object is to provide a comparatively frictionless cooperation of rotor and valve'in'i-aconstruction of the type-described thereby insuring long life and high efficiency.

A further object of thoinvehtionisrto:provide a compressor or pump of thetype described thatzis easily and cheaply made and one which. will? give* long and hard service 'without becoming broken-or? of order.

A further object of the invention; istc provide an improved compressor or pump having: a" magnetically operated valve member therein;

A fiurtherobject: of "the invention: is to provide an improved compressor or pump that has a rotor which embodies a magnet that forms the core or center of the same and a valveplate responsi-ve;toi the attraction of the same so that the face of the plate is always in line contact with the rotor.

Other ohjects-andadvantageswill be more apparent from the following-description whereiii' reference is had tothe accompanyingdrawings, upon which:

l is across-sectional view of a compressor or pump =:c'ons'tructionshowing-electromagnetic means associafed with the reciprocating valve member;

Fig:Zdsasectionalview thereof't'akemon the line 2 2 of Fig. l

3 i's an-enlarged-tragment-ary view showing the construction of-t he shoe of-thevalv'e';

Fig. 4 is a fragmentary cross-sectional view of a modified form of the invention;

Fig. 5 lea cross-sectional view or amodified'form of which the valve plate oscillates.

2,788,748 Patented Apr. 16; 1 957 "ice chosen to illustrate and describe the same, I have shown a construction wherein I provide the rotor housing 76 having achamber 78 within which the offset rotor 80 is mounted, the rotor being driven by a shaft 82 from a desired. source of power.

T he housing. has an inlet conduit 84 andan outlet condui't 86 connected to suitable bores 83 and 90 which conriectwith the chamber 78' upon opposite sides of a vertically disposed valve plate 92. The valve plate is mounted for reciprocation in the housing 94 which has a parallel walled slot 96 to receive the same. I provide a pocket 93 in the valve housing in which a permanent magnet 100 is positioned, the pocket having an opening into the slot 96- so that the valve plate 92 is in contact with'the magnet 100'.

I' have found with this construction, by making the magnet; the valve plate, and the rotor of metallic material and the rotor housing of non-metallic material, that due to the magnetic attraction, as the rotor revolves it will keep the shoe 93' in magnetic contact with the surface of the same. Thus, with this construction, the valve plate will oscillated]: line contact with the surface of the rotor dneenti'raym the magnetic attraction of the magnet, and no weights, springs or other parts are necessary to keep the val've' plate in contact with the rotor.

In Fig. 4 I have showna modified form of this construct'ion wherein I mount the magnet 95 in the interior of the rotor 97. With this construction the valve plate 92" maybe shorter and the valve housin 94 may be simplitie'd, the only requirement being for the slot 96 in With both of these constructions, the lower surface 93a of the shoe 93 is at' a considerably larger radius than the radius of the rotor 80, so that there will at all times be line Contact even when the rotor is at the side location during its movement.

Inthe'emb'odiment'of the invention shown in Figs. 5 to maneuver have provided a construction similar to that shown in Fig. 1, including tlieinlet conduit 84 and passage'tifi in the rotor housing 76. In this construction I 'als'o'providea rotor80 eccentrically mounted in the bore 78 of the housing 76. The drivingshafit'82', as best shown in Fig. 6', maybe provided with thrust or end bearings 83 and s'i located in suitable'--cavities in side walls 69 and 67 of the housing" 75. The housing 76 may include an end' plate 65' fastened thereto by suitable screw members and enclosing a sealing wire 63 located in suitable semi-cyclindrical grooves 61 and 59 in the housing 76 and endplate 65 respectively. This construction is preferred where the housing and cover'plate are made of comparatively soft aluminum so that an efiective seal will be maintained about the chamber 79 by reason of the wire sealing member embedded in its position between the two fac'ing surfaces of these parts. As can be seen in Fig. 7, the sealing wire 63 has its ends 63a and 6312 abutting the sides of the valve plate i2.

The" reciprocating valve which I prefer to employ in this construction is comparatively light, being made of a linen fiber of the type of which gears and other similar parts have been made, the fibers being comparatively tough so that the wearing qualities of this material are rotor 80. The radius of the face 14 is preferably much larger than the radius of the rotor so that at all timesa tangential contact at only one point is maintained. The valve plate 12 is adapted to reciprocate in a suitable passageway 16 on the valve plate housing 18, the plate having a pin member 20 extending upwardly therefrom and through a suitable opening 22 in the top of the valve housing. The pin is provided with a head 24 so that the valve 12 may be manually raised and lowered when desired, especially for priming or in starting the compressor or pump. t

I have provided a construction wherein air pressure is utilized to force the valve plate in sealing position against the periphery of the rotor .80. V This may include the'outlet passageway 26 and the ball check valve 28 which normally seals the same. Check valve 28 may be aligned with a vertical passageway 30 in the valve housing 18, the passageway 30 communicating with a passageway 32 at the top of the valve housing which has a port opening into the valve passageway 16, and a springpressed check valve 34 closing the other end of the same.

An outlet passageway 36 is aligned with the check valve 34.

In the operation of the compressor above described, as the compressor is forcing air under pressure through the passageway 30, pressure will be built up in the valve passageway 16 so that as the rotor 80 rotates to the position shown in Fig. 5, pressure on top of the valve plate will normally tend to hold the same in frictional contact with the rotor. This action is thus obtained without the use of springs or any other direct or other connection betweenthe valve plate and the rotor, the construction serving to function solely due to the pressure that will be built up in the passageways 3t 32 and 16 between the check valves 28 and 34. In view of the fact that there is a possibility that this pressure will diminish during rest periods of the rotor, the priming pin 20 has been provided for starting the operation of the mechanism.

In Fig. 8 I have shown a modified construction wherein I avoid the use of a priming pin 20 in connection with the valve 12, but as a substitute therefor I have provided a coiled spring member 38 at the upper end of the valve plate 12. This spring will thus be effective in starting the operation of the valve plate when the compressor is first started, it being understood that after a period of operation the pressure in the passageways 30 and 32 will be suflicient to operate the valve.

While I have illustrated and described a specific embodiment of the invention and a modification thereof, it will be apparent to those skilled'in the art that changes and modifications may be made in the exact details shown, and I do not wish to be limited in any particular; rather what I desire to secure and protect by Letters Patent of the United States is:-

l. The combination of a housing having a pair of spaced parallel walls with a cylindrical chamber therein, a cylindrically shaped rotor in said chamber, a drive shaft extending from said rotor through a bearing in one of said side walls, said drive shaft axially mounted in said wall with respect to said chamber, said rotor eccentrically mounted on said drive shaft, a reciprocal plate valve mounted in said housing, an inlet conduit in said housing on one side of said plate, an outlet conduit in said housing on the other side thereof and a permanent magnet in said. housing for keeping an edge of said plate against the periphery of said rotor at all times, said magnet rectangular in shape and positioned against a side of said plate valve and in sliding engagement with the same, said plate and rotor being magnetic material and said housing being of non-magnetic material.

2. The combination of a housing having a pair of spaced parallel walls with a cylindrical chamber therein, a cylindrically shaped rotor in said chamber, a drive shaft extending from said rotor through a bearing in one of said side walls, said driveshaft axially mounted in said wall with respect to said chamber, said rotor eccentrically mounted on said drive shaft, a reciprocal plate valve mounted in said housing, an inlet conduit in said housing on one side of said plate, an outlet conduit in said housing on the other 'side thereof and magnetic means in said housing for keeping an edge of said plate against the periphery of said rotor at all times, said magnetic means including a rectangularly shaped permanent magnet positioned against one side of said plate valve and, in sliding engagementtwith the same, said plate and rotor being magnetic material and said housing being of non-magnetic material, said permanent magnet positioned in said housing above said inlet conduit.

3. The combination of a housing having apair of spaced parallel walls with a cylindrical chamber therein, a cylindrically shaped rotor in saidchamber, a drive shaft extending from said rotor through a bearing in one of said side walls, said drive shaft 'axiallymounted in said side wall with respect to said chamber said rotor eccentrically mounted on said drive shaft, a reciprocal plate valve mounted in said housing, an inlet conduit in said housing on one side of said plate, an outlet conduit in said housing,

on the other side thereof and magnetic means in said housing for keeping an edge of said plate against-the periphery of said rotor at all times, said magnetic means including a permanent magnet rectangular in shape and positioned against a side of said plate valve and in sliding engagement with the same, said plate valve and rotor being magnetic material and said housing being of nonmagnetic material, said permanent magnet positioned in said housing above said inlet conduit, said reciprocating plate valve having a shoe at'its lower end, said shoe extending to both sides of said plate valve and having its lower wall formed on an arc the same radius'as the radius of said rotor.

4. The combination of a housing having a pair of spaced parallel walls with a cylindrical chamber therein, a cylindrically shaped rotor in said chamber, a drive shaft extending from said rotor through a bearing in one of said side walls, said drive shaft axially mounted in said wall with respect to said chamber, said rotor eccentrically mounted on said drive shaft, a reciprocal plate valve mounted in said housing, an inlet conduit in said housing on one side of said plate, an outlet conduit in said housing on the other side thereof and magnetic means in said housing for keeping an edge of said plate against the periphery of said rotor'at all times, said magnetic means including a permanent magnet rectangular in shape and positioned against a side of said plate valve, and in sliding engagement with said plate valve, said plate valve and rotor being magnetic material and said housing being of non-magnetic materiahsaid permanent magnet positioned in said housing above said inlet conduit, said reciprocating plate valve having a shoe at its lower end, said shoe extending to both sides of said platevalve and having its lower wall formed on an arc the same radius as the radius of said rotor, said cylindrical chamber having a rectangularly shaped depression in its upper surface to' receive said shoe at the 'upper end of the stroke of said rotor.

References Cited in the file of this patent UNITED STATES PATENTS 885,006 Barnes Apr. 21, 1908 1,076,711 Slesazeck Oct.-28, 1913 1,163,309 Barnford Dec. 7, 1915 1,770,141 Meyer July 8, 1930 1,890,571 Dubrovin Dec. 13, 1932 1,890,573 Dubrovin Dec. 13, 1932 1,949,710 Dubrovin Mar. 6, 1934 1,996,620 Ketterer Apr. 2, 1935 2,671,605 Grumblatt Mar. 9, 1954 2,699,288 Szezepanek Jan. 11, 1955 FOREIGN PATENTS 681,601 France v Feb. 3,1930 

